Oracle Drop User Cascade

In order to drop a user, you must have the
Oracle DROP USER system privilege. The command line syntax for dropping
a user can be seen below:

DROP
USER edward CASCADE;

If a user owns any database objects, that user
can only be dropped with the Oracle DROP USER CASCADE
command. The Oracle DROP USER CASCADE
command drops a user and all owned objects.

The user will not be dropped and an error
message will be returned if you a user owns objects and you fail to use
the Oracle DROP USER CASCADE
command.

As the DROP USER CASCADE command is a DDL
command, after the Oracle DROP USER CASCADE command has been
executed, a rollback to re-create the user and his objects cannot be
completed.

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